Hey julians. I found this one a little tricky to fix. I have a rosenbrock function that takes 2 values and returns 1 value. So I was trying to run this as a comprehension, but I am getting out a (401,401) array, instead of a (401,1) array. Here is the code.

```
x = -2:0.01:2
y = -2:0.01:2
rosenbrock(x,p) = (p[1] - x[1])^2 + p[2] * (x[2] - x[1]^2)^2
z = [rosenbrock([i, j], p) for i=x, j=y]
```

But I keep getting out a (401,401) array instead of a 401,1 array. Now it makes sense that the comprehension is iterating over the `i`

and `j`

dimensions, so there are probably repeated entries. But still I was not clear on how to fix this. I tried parenthesis `(i=x, j=y)`

.

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